Coloring instrument



FIG. 1 is a top front perspective view of a coloring instrument showing our new design;

FIG. 2 is a front elevation thereof, the undisclosed rear portion being a mirror image of the front shown; and

FIG. 3 is a side elevation thereof.

The drawings are provided with the recognized lining symbols to indicate that the shaft portion of the coloring instrument is transparent. 

The ornamental design for a coloring instrument, as shown and described. 